The Effect of Ultrasound on Permeation Flux and Changes in Blocking Mechanisms during Dead-End Microfiltration of Carrot Juice
Carrot juice is one of the most nutritious foods that are consumed around the world. Large particles in carrot juice causing turbid appearance make some problems in the concentration process such as off-flavor due to the large particles burnt on the walls of evaporators. Microfiltration (MF) is a pressure driven membrane separation method that can clarify fruit juices without enzymatic treatment. Fouling is the main problem in the membrane process causing reduction of permeate flux. Ultrasound as a cleaning technique was applied at 20 kHz to reduce fouling in membrane clarification of carrot juice using dead-end MF system with polyvinylidene fluoride (PVDF) membrane. Results showed that application of ultrasound waves reduce diphasic characteristic of carrot juice and permeate flux increased. Evaluation of different membrane fouling mechanisms showed that application of ultrasound waves changed creation time of each fouling mechanism. Also, its behavior was changed with varying transmembrane pressure.
 Jabbar, S., Abid, M., Hu, B., Wu, T., Muhammad, H. M., Lei, S., et al. (2014). “Quality ofcarrot juice as influenced by blanching and sonication treatments”. LWT – FoodScience and Technology, 55, 16–21.
 Martínez-Flores, H. E., Garnica-Romo, M. G., Bermúdez-Aguirre, D., Pokhrel, P. R., & Barbosa-Cánovas, G. V. (2015). Physico-chemical parameters, bioactive compounds and microbial quality of thermo-sonicated carrot juice during storage. Food chemistry, 172, 650-656.
 Anastasakis, M., Lindamood, J. B., Chism, G. W., & Hansen, P. M. T. (1987). Enzymatic hydrolysis of carrot for extraction of a cloud-stable juice. Food Hydrocolloids, 1(3), 247-261.
 Ertugay, M. F., & Başlar, M. (2014). The effect of ultrasonic treatments on cloudy quality-related quality parameters in apple juice. Innovative Food Science & Emerging Technologies, 26, 226-231.
 Liang, C., Hu, X., Ni, Y., Wu, J., Chen, F., & Liao, X. (2006). Effect of hydrocolloids on pulp sediment, white sediment, turbidity and viscosity of reconstituted carrot juice. Food hydrocolloids, 20(8), 1190-1197.
 Cheng, L. H., Soh, C. Y., Liew, S. C., & Teh, F. F. (2007). Effects of sonication and carbonation on guava juice quality. Food Chemistry, 104(4), 1396-1401.
 Mirsaeedghazi, H., Emam-Djomeh, Z., Mousavi, S. M., Aroujalian, A., & Navidbakhsh, M. (2010). Clarification of pomegranate juice by microfiltration with PVDF membranes. Desalination, 264(3), 243-248.
 Mirsaeedghazi, H., Emam-Djomeh, Z., Mousavi, S. M., Aroujalian, A., & Navidbakhsh, M. (2009). Changes in blockingmechanisms duringmembrane processing of pomegranate juice. International Journal of Food Science and Technology, 44, 2135–2141.
 Alventosa-deLara, E., Barredo-Damas, S., Alcaina-Miranda,M. I., & Iborra-Clar,M. I. (2014). Study and optimization of the ultrasound-enhanced cleaning of an ultrafiltration ceramic membrane through a combined experimental–statistical approach. Ultrasonic Sonochemistry, 21, 1222–1234.
 Cai, M., Zhao, S., & Liang, H. (2010). Mechanisms for the enhancement of ultrafiltration and membrane cleaning by different ultrasonic frequencies. Desalination, 263, 133–138.
 Aghdam, M. Aliasghari, et al. "Effect of ultrasound on different mechanisms of fouling during membrane clarification of pomegranate juice." Innovative Food Science & Emerging Technologies 30 (2015): 127-131.
 Hermia, J. (1982). Constant pressure blocking filtration laws application to power-lawnon-Newtonian fluids. Chemical Engineering Research and Design, 60, 183–187.